feat: use saveChatCompletion in handleChatStream to match handleChatGenerate (MYC-3962)#135

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testrecoupable/api:testfrom

sweetmantech/myc-3962-add-message-persistence-to-apichat-match-apichatgeneraterecoupable/api:sweetmantech/myc-3962-add-message-persistence-to-apichat-match-apichatgenerateCopy head branch name to clipboard